Atomoxitine for the past few years. Recently I have tried modafinil to supplement it. It's like a lightweight version of stimulants. I find that I don't need a normal 100 mg dose for it to work. 50 mg is enough, and I think even 25 mg it has a noticeable effect.
I am experimenting with Adderall on one or two days per week, then modafinil for 2-3 more, with atomoxitine everyday. (I basically supplement my strattera Monday through thursday, and occasionally on a Friday to make work easier.) This seems like a really useful combination to me so far, and with this dosing schedule, it seems like it will take a very long time for me to build up a tolerance, if I ever do.
I love my prescriber. He knows that I am fairly cautious about medications, so he is willing to prescribe different things over time to see what works best.
I don't find caffeine effective for ADHD, but amphetamine (Adderall) is. It is quite likely that the mechanism of action for methamphetamine is much more like other amphetamine formulations.
That said, I'm not even sure if they were talking about meth or something else.